Exam: Juniper Junos Associate JN0-105 (JNCIA-Junos) Exam (JN0-105)

The JNCIA-Junos certification is designed for networking professionals with beginner-intermediate knowledge of networking. The written exam verifies your understanding of the core functionality of the Juniper Networks Junos OS.

Because JNCIA-Junos provides a core understanding of the Juniper Networks core operating system, it serves as the baseline certification for multiple certification tracks:

- Enterprise Routing and Switching Certification Track

- Service Provider Routing and Switching Certification Track

Exam Length

- 90 minutes

Exam Type

- 65 multiple-choice questions

Software Versions

- Junos OS 21.2

1- Networking Fundamentals

Identify the concepts and functionality of various fundamental elements of networking

• Collision domains and broadcast domains
• Function of routers and switches
• Ethernet networks
• Layer 2 addressing, including address resolution
• Layer 3 / IP addressing, including subnet masks
• IPv4 / IPv6
• Subnetting and supernetting
• Decimal to binary conversion
• Longest match routing
• CoS
• Connection-oriented vs. connectionless protocols

2- Junos OS Fundamentals

Identify the concepts, benefits, or functionality of the core elements of the Junos OS, including:

• Software architecture
• Control and forwarding planes
• Routing engine and packet-forwarding engine
• Transit traffic processing
• Exception traffic

3- User Interfaces

Identify the concepts, operation, or functionality of the Junos user interface, including:

• CLI functionality
• CLI modes
• CLI navigation
• CLI Help
• Filtering output
• Active vs. candidate configuration
• Reverting to previous configurations
• Modifying, managing, and saving configuration files
• Viewing, comparing, and loading configuration files
• J-Web (core/common functionality only)

4- Configuration Basics

Identify the main elements for configuring Junos devices, including:

• Factory-default state
• Initial configuration
• User accounts
• Login classes
• User authentication methods
• Interface types and properties
• Configuration groups
• Additional initial configuration elements, such as Network Time Protocol (NTP), SNMP, system log
• Configuration archival
• Logging and tracing
• Rescue configuration

Describe how to configure basic components of a Junos device

5- Operational Monitoring and Maintenance

Identify methods of monitoring or maintaining Junos devices, including:

• Show commands
• Monitor commands
• Interface statistics and errors
• Network tools, such as ping, traceroute, telnet, SSH, etc.
• Junos OS installation and upgrades
• Powering on and shutting down Junos devices
• Root password recovery

Describe monitoring or maintenance procedures for a Junos device

6- Routing Fundamentals

Identify basic routing concepts or functionality for Junos devices, including:

• Traffic forwarding concepts
• Routing tables
• Routing vs. forwarding tables
• Route preference
• Routing instances
• Static routing
• Advantages of and use cases for dynamic routing protocols

Describe how to configure or monitor basic routing elements for a Junos device

7- Routing Policy and Firewall Filters

Identify the concepts or functionality of routing policy and firewall filters on Junos devices

• Default routing policies
• Import and export policies
• Routing policy flow
• Effect of policies on routes and routing tables
• Policy structure and terms
• Policy match criteria, match types, and actions
• Firewall filter concepts
• Filter structure and terms
• Filter match criteria and actions
• Effect of filters on packets
• Unicast reverse-path-forwarding (RPF)

Describe how to configure or monitor routing policies and firewall filters on a Junos device

Recommended Training

• Getting Started with Networking
• Introduction to the Junos OS

Exam Resources

• Industry/product knowledge
• Juniper TechLibrary

Additional Preparation

• Juniper Learning Portal